String Buffering

Author: Ravi Poswal

A string buffer is a string object or changeable character sequence. The string buffer default capacity is 16 characters. It contains synchronized methods which means thread-safe. There are various constructors:-

public StringBuffer();

public StringBuffer(int capacity);

public StringBuffer(String s);

1. length():- Find out the string's length.

Syntax:- public synchronized int length();

Example :-        StringBuffer s1=new StringBuffer("hello");

System.out.println(s1.length()); =>5

2. capacity():- It is to find out the StringBuffer object's current capacity.

Syntax:- public synchronized int capacity();

Example:-         StringBuffer b = new StringBuffer( );

System.out.println(“default Capacity”+ b.capacity()); =>16

3. append():- It is used to concatenate the given string with the given argument.

Syntax:-public synchronized StringBuffer append(primitive type)

Example:-         StringBuffer b = new StringBuffer("Hi");

StringBuffer c= b.append("Indian");

System.out.println(b); //HiIndian

System.out.println(c); //HiIndian

4. insert():-Using this technique, a string may be inserted at a certain location.

Syntax:-public synchronized StringBuffer insert(int, String);

Example:-         StringBuffer s=new StringBuffer("Hello"); 

 s.insert(2,"india");

System.out.println(s); //Heindiallo

5. replace():- It is used to replace the given string from the specific position.

Syntax:- public synchronized StirngBuffer replace(int, int, String)

Example:-         StringBuffer r=new StringBuffer("india"); 

r.replace(1,3,"Welcome to");

System.out.println(r); =>iWelcome toia

Code Example

class A
{
public static void main(String arr[])
{ A b = new A(); 
System.out.println("Default Capacity= "+ b.capacity());
 b.append("hello i am indian.");
System.out.println("Capacity after append= "+ b.capacity()); 
System.out.println("capacity after append " +b);
}
}
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